不同作物实现杂优利用的途径、历程及其难度,因花器构造,授粉特性、繁殖系数、栽培方式以及“三系”配套研究进展的不同而差别较大。玉米因雌雄异花、去雄较易使其成为实现农作物杂优利用的开路先锋;部分蔬菜则因其高倍繁殖系数及育苗移 The way, process and difficulty of different crops to realize heterosis utilization vary greatly due to the differences in flower structure, pollination characteristics, propagation coefficient, cultivation methods and the progress of “three lines” supporting research. Maize due to dioecious, to the male easier to make it a pioneer in realizing the use of crop miscellaneous advantages; part of the vegetables because of its high multiplication coefficient and nursery